package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.apache.commons.collections4.BagUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 判断购物车中得商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 如果已经存在，只需要将数量加1
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            // 如果不存在，需要插入一条购物车数据

            // 判断本次添加到购物车中得是菜品还是套餐
            Long setmealId = shoppingCartDTO.getSetmealId();
            Long dishId = shoppingCartDTO.getDishId();
            if (setmealId != null) {
                // 本次添加得是套餐
                Setmeal setmeal = setmealMapper.getListById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            } else {
                // 本次添加得是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     *
     * @param currentId
     * @return
     */
    public List<ShoppingCart> list(Long currentId) {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(currentId).build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     *
     * @param currentId
     */
    public void clean(Long currentId) {
        shoppingCartMapper.clean(currentId);
    }

    /**
     * 删除购物车中一个商品
     *
     * @param shoppingCartDT
     */
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        Long dishId = shoppingCartDTO.getDishId();

        ShoppingCart cart = list.get(0);
        Integer number = cart.getNumber();
        if (number > 1) {
            cart.setNumber(number - 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            shoppingCartMapper.sub(cart);
        }


    }
}
